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Dive into the research topics where Fatma Tokmak is active.

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Featured researches published by Fatma Tokmak.


Boundary Value Problems | 2013

Existence of symmetric positive solutions for a multipoint boundary value problem with sign-changing nonlinearity on time scales

Fatma Tokmak; Ilkay Yaslan Karaca

In this paper, we make use of the four functionals fixed point theorem to verify the existence of at least one symmetric positive solution of a second-order m-point boundary value problem on time scales such that the considered equation admits a nonlinear term f whose sign is allowed to change. The discussed problem involves both an increasing homeomorphism and homomorphism, which generalizes the p-Laplacian operator. An example which supports our theoretical results is also indicated.MSC:34B10, 39A10.


Journal of Inequalities and Applications | 2013

Existence of positive solutions for third-order boundary value problems with integral boundary conditions on time scales

Ilkay Yaslan Karaca; Fatma Tokmak

In this paper, four functionals fixed point theorem is used to verify the existence of at least one positive solution for third-order boundary value problems with integral boundary conditions for an increasing homeomorphism and homomorphism on time scales. We also provide an example to demonstrate our results.MSC:34B18, 34N05.


Abstract and Applied Analysis | 2012

Existence of Positive Solutions for Third-Order -Point Boundary Value Problems with Sign-Changing Nonlinearity on Time Scales

Fatma Tokmak; Ilkay Yaslan Karaca

A four-functional fixed point theorem and a generalization of Leggett-Williams fixed point theorem are used, respectively, to investigate the existence of at least one positive solution and at least three positive solutions for third-order -point boundary value problem on time scales with an increasing homeomorphism and homomorphism, which generalizes the usual -Laplacian operator. In particular, the nonlinear term is allowed to change sign. As an application, we also give some examples to demonstrate our results.


Mathematical Problems in Engineering | 2014

Existence of Solutions for Nonlinear Impulsive Fractional Differential Equations with -Laplacian Operator

Ilkay Yaslan Karaca; Fatma Tokmak

This paper studies the existence of solutions for a nonlinear boundary value problem of impulsive fractional differential equations with -Laplacian operator. Our results are based on some standard fixed point theorems. Examples are given to show the applicability of our results.


Journal of Inequalities and Applications | 2014

Existence of positive solutions for p-Laplacian impulsive boundary value problems on time scales

Fatma Tokmak; Ilkay Yaslan Karaca

In this paper, by using fixed point index theory and a double fixed point theorem, we study the existence of many positive solutions for a class of second-order p-Laplacian boundary value problems with impulse on time scales. An example which supports our theoretical results is also indicated.MSC:34B18, 34B37, 34K10.


Boundary Value Problems | 2014

Eigenvalues for iterative systems of nonlinear m-point boundary value problems on time scales

Ilkay Yaslan Karaca; Fatma Tokmak

In this paper, we determine the eigenvalue intervals of the parameters λ1,λ2,…,λn for which there exist positive solutions of the iterative systems of m-point boundary value problems on time scales. The method involves an application of Guo-Krasnosel’skii fixed point theorem. We give an example to demonstrate our main results.MSC:34B18, 34N05.


Advances in Difference Equations | 2014

Existence of three symmetric positive solutions for a second-order multi-point boundary value problem on time scales

Aycan Sinanoglu; Ilkay Yaslan Karaca; Fatma Tokmak; Tugba Senlik

In this article, we investigate the existence of at least three symmetric positive solutions of a second-order multi-point boundary value problem on time scales. The ideas involve Bai and Ge’s fixed point theorem. As an application, we give an example to demonstrate our main result.MSC:34B10, 34B18, 39A10.


Advances in Difference Equations | 2013

Existence results for p -Laplacian boundary value problems of impulsive dynamic equations on time scales

Özlem Özen; Ilkay Yaslan Karaca; Fatma Tokmak

In this paper, Bai-Ge’s fixed point theorem is used to investigate the existence of positive solutions for second-order boundary value problems of p-Laplacian impulsive dynamic equations on time scales. As an application, we give an example to demonstrate our results.MSC:34B18, 34N05, 39B37.


Archive | 2014

MULTIPLE POSITIVE SOLUTIONS OF BOUNDARY VALUE PROBLEMS FOR P-LAPLACIAN IMPULSIVE DYNAMIC EQUATIONS ON TIME SCALES

Ilkay Yaslan Karaca; Özlem Özen; Fatma Tokmak


Archive | 2011

EXISTENCE OF THREE POSITIVE SOLUTIONS FOR M-POINT TIME SCALE BOUNDARY VALUE PROBLEMS ON INFINITE INTERVALS

Ilkay Yaslan Karaca; Fatma Tokmak

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